SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468
The first parts of the Feb. 4 spacewalk are similar to the previous one. Lopez-Alegria and Williams begin the tasks of the second spacewalk by reconfiguring the second of the two cooling loops serving Destiny from the temporary to the permanent system.
At the rats’ nest, Lopez-Alegria will reconfigure the fluid loop connections, moving the second pair of the fluid lines of the early system from the lab and connecting them back up to the Z1 panel. That will help enable reactivation of the early cooling system if it should be required.
Williams will reconfigure electrical connections. The job, like the similar activity on the first spacewalk, is expected to take about 1 hour, 45 minutes.
Next they will watch as the ground retracts the aft radiator of the P6. After retraction they will install another set of six cable cinches and two winch bars to secure the radiator and then install the shroud. Again, those tasks should take about 2 hours, 20 minutes.
Lopez-Alegria will then move to the end of PMA-1 to remove a sunshade from the Node Multiplexer-Demultiplexer (MDM), a data relay system. The area was in the sun during the time the station flew in a previous orientation. Now, with the station's orientation putting the lab in the direction of travel and its 18-inch window always facing the Earth, the sunshade is being removed to keep the MDM from getting too cold.
Lopez-Alegria will remove a single bolt to free the sunshade, then move with it a short distance on the PMA-1 and jettison it aft and a little to starboard.
Meanwhile, Williams will bring tools and cables to the forward end of the lab, where Lopez-Alegria will join her. Together they will finish routing and installation of the SSPTS cables.
Get-ahead tasks include photographing a connector on the end of PMA-2. Shuttle-station audio communication difficulties have been reported during recent shuttle missions. Engineers believe the connector might be affected by debris or corrosion.